Don't fail when cleaning if skip_clean_paths is empty

1 files changed, 5 insertions, 1 deletions

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 57db673ba..39d8ee120 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -372,7 +372,7 @@ private
       end
     end
 
-    attr_rw :url, :version, :homepage, :head, :deps, :skip_clean_paths, *CHECKSUM_TYPES
+    attr_rw :url, :version, :homepage, :head, :deps, *CHECKSUM_TYPES
 
     def depends_on name, *args
       @deps ||= []
@@ -402,6 +402,10 @@ private
         @skip_clean_paths << p.to_s unless @skip_clean_paths.include? p.to_s
       end
     end
+    
+    def skip_clean_paths
+      @skip_clean_paths or []
+    end
   end
 end